Floating reamer holder



June 16, 1931. e. H. THOMAS FLOATING REAMER HOLDER 2 Sheets- Sheet 1 Original Filed Oct. 4, 1925 m mm E fl e/ w v F l. E

'June 16, 1931. G. 'H. THOMAS Y FLOATING REAMER HOLDER 2 Sheets-Sheet 2 Original Filed Oct. 4 1926 her.

Patented June 16, 193i UNITED STATES PAT FF CB; i

GEORGE 1-1 THOMAS, 013 ERIE, P NNS LVANI Ass GNoRTo AMERICAN s'rnn' xnrznn..

COMPANY, or ERIE, PENNSYLVANIA, A'GORPORATION OFTENNSYLVANIA. w

FLOATING KRAMER. 'iionnna Application filed October '4, 1926, seriaino'. 139,448; .nenewea" a rii zafieea r The object of the invention is to provide a reamer holder with a floating driving connection which will permit the tool to be guided by the hole both as to off-setting and angular 5 mis-alinement. Features and details of the invention will appear and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings from the specification m as follows Fig. 1 shows a side view of the holder, partly in section.

Fig. 2 an end view of the shank. Fig. 3 a plan view of an intermediate mem Fig. l an end view of the holder, or split member.

Fig. 5 a side elevation of the shank end.

member detached.

Fig. 7 a side elevation of the socket, or holder member.

I Fig. 8 a retaining member. 1

Fig. 9 a sectional view of the retaining member.-

Fig. 10 a plan View of a split ring that 00- the driving head ofa drill press. A groove a is arranged'adjacent to the lower end of the shank and the shank is transversely slotted providing the driving shoulders a, a, at the sides of the slot.

An intermediate member B is ofrectangumounted in the transverse slot in the end of the shank A between the shoulders at, a.

A'socket, or holder member C is provided with a socket C adapted to receive the shank of a reamer D. The reamer is shown with theusual drivingtangd and the socket memher with the usual transverse opening C for Fig. 6 a side elevation of an intermediate V be of any constructlon adapting it for attachment to a tool, such as the head' of a turret lathe, orv

receiving the tang Band for facilitating the I removal of the reainer from the socket.

An annular gr bvea is arranged around the socket member adjacent to its upper end and 1t is provided with a transverse slot across its upper end, thisslot forming dri'ving shoulders, "0: 0', whichshou'lders are I adapted toslidingly engage'the sides of'the' intermediate member B. .The parts are assembled with the slots at the ends of the shank andsocket member arranged alter,-

nately, or crosswise of eachother," and the may be necessary to permit the reamer to follow the;hole.f 'At thefsame time it maintains, under all conditions, a perfect driving connection betweenfthe shank and the socketv I mediate member engage thethrust faces at member.. The spherical: faces b oftheinterthe bottoms of the slots'in the ends of the shank and SocketQmember. Forming engaging thrust surfaces with point contacts by making somelofthe surfaces, as thefsur faces I sphericalmaintains the thrust approximately centralfeven though the socket member. ay be in angular fmis-alinement withthe shank as clearly shown" in Fig. "12. "If these surfaces 'wereformed perfectly flat it will be readily" observedthat with the tilting or the? socket member relatively to the shank,-assh own in that figure, the thrust would. 'be transferred to the; extreme edge-.

of the intermediate member and wouldtend to disturb the accuratefollowing of the-hole by the reamer. L r Inorder'tojhold themembers in assembly and with such limited playbetweeinIthe memj bers as'm y be necessary totake care of mis alinement I provide the following mecharA retaining member E,in the formg'o f a sleeve. is provided with the internal flanges er'at its endsi Split rings F,'-F .are' arranged in the annular grooves a, 0, respectively." The sleeve E encloses'therings F,'F,' and the I flanges e engage these rlngs locking theparts I together but permitting alimited movement to allow the necessary flexibility of the socket engaging surfaces.

member relatively to the shank but limit-- ing this movement within a fairly close range so that the tool may be held in proper position to enter the work. In the operation of the device the shank A, as before stated, is mounted in the tool and may be moved to the work, or rotated, or it may remain stationary and the Work moved, or rotated relatively to it in accord- 1o ance with the common practice. The rca-mer is forced into the hole, the thrust being communicated through the intermediate member acting on the spherical surfaces and is free to follow the hole'even though there be considerable mis'-alinement'. The retainingmemhers. hold the socket member in proper'position to direct thetool to the work.

l/Vhat I claim as new is V l. A tool holder comprising a shank memher; an intermediate member; a socket member; transverse shoulders forming a transversely sliding driving connection between the shank member and the intermediate member; and transverse shoulders forming a transversely sliding driving connection between the intermediate member and the socket member, said shoulders being alternately arranged, said shank member, intermediatemembenand socket member having centrally engaging thrust surfaces, said surfaces gradually receding from each other from the'center out and maintaining. an ap-' proximately central thrust relation through "the intermediate member. v 2.. Ar holder accordingjto claim 1 in which the transverse shoulders are arranged on the shank andIsocket member. I 3. A holder according to claim 1 in which the intermediate member has convexly curved 4. A holder according to claim 1 in which the/transverse shoulders are on the shank and socket members and the-intermediate member hasconvexly .curved engaging surfaces.

5 Aholder according toclaim 1,. on which there is provided a means maintaining the shank and socket members in flexible connection with each other. v

' 6. A holder accordingto claim 1 in which the transverse shoulders are arranged on the shank and socket members and means are provided for maintaining said shank, and socket members in flexible connection with each other. 7 1

7 A holder according to claim 1 in which i-thetransverse shoulders are arranged on the shank and socket members and the interme- V diatemember has convexly curved engaging 1 V-surfaces and in which means is provided for maintaining the shank and socket members in flexible connection with each other.

In testimony whereof I aflix my signature.

GEORGE H. THOMAS. 

